Discussion:
​Fwd: IBM mainframe containers grow more secure | ZDNet
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Mark Regan
2018-10-05 15:56:00 UTC
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https://www.zdnet.com/article/ibm-mainframe-containers-grow-more-secure/

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2018-10-05 18:23:44 UTC
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Post by Mark Regan
https://www.zdnet.com/article/ibm-mainframe-containers-grow-more-secure/
"In the 1960s, IBM's OS/650 mainframe operating system..."

Given that, what reason is there to read the rest of the article?

Bob Netzlof
Joel C. Ewing
2018-10-06 01:20:49 UTC
Permalink
Post by Mark Regan
https://www.zdnet.com/article/ibm-mainframe-containers-grow-more-secure/
From the first paragraph of the above article:
“In the 1960s, IBM's 650 mainframe operating system had two modes, MFT
and MVT, in which process got its own address space and couldn't
interface with others processes running parallel with it. This was the
ancestor to both virtual machines (VM) and containers.”

This illustrates the dangers of someone whose computer education starts
with the Z80 attempting to write anything relating to IBM mainframe
history after inadequate  research:

confusing the 1964 IBM S/360 with the 1953 IBM 650;

thinking there were only two [S/360] Operating Systems, MFT and MVT,
when those were only slightly different variants of the same S/360
OS/360 Operating System, with other competing Operating Systems for
smaller S/360 systems;

thinking both of the above supported multiple virtual address spaces,
when (except for S/360/67) the S/360 hardware didn't even support
virtual storage, much less multiple virtual address spaces;  Storage
protect keys allowed for some isolation between partitions in the single
address space, but the isolation was not total;

thinking either of those Operating Systems had anything to do with the
independent development track of VM/370 for IBM S/370.

    JC Ewing
--
Joel C. Ewing, Bentonville, AR ***@acm.org

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Gerard Schildberger
2018-10-06 15:25:26 UTC
Permalink
Post by Joel C. Ewing
Post by Mark Regan
https://www.zdnet.com/article/ibm-mainframe-containers-grow-more-secure/
“In the 1960s, IBM's 650 mainframe operating system had two modes, MFT
and MVT, in which process got its own address space and couldn't
interface with others processes running parallel with it. This was the
ancestor to both virtual machines (VM) and containers.”
This illustrates the dangers of someone whose computer education starts
with the Z80 attempting to write anything relating to IBM mainframe
confusing the 1964 IBM S/360 with the 1953 IBM 650;
thinking there were only two [S/360] Operating Systems, MFT and MVT,
when those were only slightly different variants of the same S/360
OS/360 Operating System, with other competing Operating Systems for
smaller S/360 systems;
There was another OS along with MFT and MVT: PCP
(Primary Control Program), a striped down MFT.
_____________________________________________ Gerard Schildberger
Post by Joel C. Ewing
thinking both of the above supported multiple virtual address spaces,
when (except for S/360/67) the S/360 hardware didn't even support
virtual storage, much less multiple virtual address spaces;  Storage
protect keys allowed for some isolation between partitions in the single
address space, but the isolation was not total;
thinking either of those Operating Systems had anything to do with the
independent development track of VM/370 for IBM S/370.
    JC Ewing
Seymour J Metz
2018-10-09 18:50:57 UTC
Permalink
As usual, ZD gets it wrong.


--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3

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From: IBM Mainframe Discussion List <IBM-***@listserv.ua.edu> on behalf of Mark Regan <***@GMAIL.COM>
Sent: Friday, October 5, 2018 11:55 AM
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Subject: ​Fwd: IBM mainframe containers grow more secure | ZDNet

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